B125
Understanding the Impacts of Climate Change on Terrestrial Ecosystem Carbon Dynamics Over the Pan-Arctic with Observations and Models

Session ID#: 83150

Session Description:
The pan-Arctic terrestrial ecosystems have been experiencing dramatic changes in hydroclimatic regimes during recent decades, affecting ecosystem greenhouse gas (GHG) emissions which in turn feedback to the climate system. Recent studies have revealed complex linkages between soil thermal-hydrological processes and GHG emissions, e.g., in-situ observations have shown that rainfall is an important heat transporter and alters the biogeochemical processes responsible for GHG emissions by advancing permafrost thaw and warming thermokarst soils. However, the representation of coupled soil thermal-hydrological-biogeochemical processes in the land component of Earth System Models is currently insufficient to accurately model present-day and future carbon dynamics. This session solicits contributions discussing how the permafrost soil thermal-hydrological dynamics impact terrestrial ecosystem carbon and nutrient cycles currently and in the future, and affect the coupled carbon-climate feedback loop. Studies taking advantage of multiple data and approaches (e.g., in-situ, remote-sensing, and modeling) to characterize and evaluate carbon dynamics are particularly welcomed.
Index Terms:

0414 Biogeochemical cycles, processes, and modeling [BIOGEOSCIENCES]
0475 Permafrost, cryosphere, and high-latitude processes [BIOGEOSCIENCES]
0708 Thermokarst [CRYOSPHERE]
0793 Biogeochemistry [CRYOSPHERE]

Primary Convener:  Jing Tao, Lawrence Berkeley National Laboratory, Berkeley, CA, United States; University of Washington Seattle Campus, Civil and Environmental Engineering, Seattle, WA, United States
Conveners:  Qing Zhu, Lawrence Berkeley National Laboratory, Berkeley, CA, United States, Rebecca Bergquist Neumann, University of Washington Seattle Campus, Civil and Environmental Engineering, Seattle, WA, United States and Zhen Zhang, University of Maryland College Park, College Park, MD, United States
Primary Liaison:  Jing Tao, Lawrence Berkeley National Laboratory, Berkeley, CA, United States; University of Washington Seattle Campus, Civil and Environmental Engineering, Seattle, WA, United States
 
Changes in CO2 and CH4 exchange with climate change in an Arctic polygonal tundra depend on rates of permafrost thaw as affected by changes in vegetation and drainage (Invited) (487823)
Robert F Grant1, Zelalem Amdie Mekonnen2 and William J Riley2, (1)University of Alberta, Department of Renewable Resources, Edmonton, AB, Canada, (2)Lawrence Berkeley National Laboratory, Berkeley, CA, United States
 
Carbon Accumulation, Flux, and Fate in Stordalen Mire (502355)
Marjorie Elizabeth Holmes1, Patrick M Crill2, William C Burnett3, Carmody K McCalley4, Rachel Wilson3, Steve E Frolking5, Kuang-Yu Chang6, William J Riley7, Ruth K Varner8, Suzanne Hodgkins9, Virginia Isabel Rich9,10, Scott R Saleska11, Jeff Chanton3 and IsoGenie Project Coordinators, (1)Tallahassee Community College, Tallahassee, FL, United States, (2)Stockholm University, Stockholm, Sweden, (3)Florida State University, Tallahassee, FL, United States, (4)Rochester Institute of Technology, Rochester, NY, United States, (5)University of New Hampshire, Durham, NH, United States, (6)University of California Davis, Davis, CA, United States, (7)Lawrence Berkeley National Laboratory, Berkeley, CA, United States, (8)University of New Hampshire, Department of Earth Sciences, Durham, NH, United States, (9)Ohio State University, Columbus, OH, United States, (10)University of Arizona, Tucson, AZ, United States, (11)University of Arizona, Department of Ecology & Evolutionary Biology, Tucson, AZ, United States
 
Isotopic and high resolution analytical techniques to investigate the stability of peat soils across gradients in latitude and altitude (Invited) (502559)
Jeff Chanton1, Brittany Aiello Verbeke2, Katy J. Sparrow3, Rachel Wilson1, Robert G Spencer4, Paul J Hanson5, René Dommain6, Suzanne B Hodgkins7, Malak M Tfaily8, Stephen D Sebestyen9, Natalie Griffiths5, Marjorie Elizabeth Holmes10, Erik Lilleskov11, Louis J Lamit12, Virginia Isabel Rich8, Scott D Bridgham13, Scott R Saleska14, Patrick M Crill15, Ruth K Varner16, Anya Hopple13 and Joel E Kostka17, (1)Florida State University, Tallahassee, FL, United States, (2)Florida State University, Dept. of Earth, Ocean, & Atmospheric Science, Tallahassee, FL, United States, (3)University of Rochester, Rochester, NY, United States, (4)Woods Hole Research Center, Falmouth, MA, United States, (5)Oak Ridge National Laboratory, Oak Ridge, TN, United States, (6)University of Greifswald, Greifswald, Germany, (7)Florida State University, Dept. of Chemistry & Biochemistry, Tallahassee, FL, United States, (8)University of Arizona, Tucson, AZ, United States, (9)USDA Forest Service, Northern Research Station, Vallejo, CA, United States, (10)Tallahassee Community College, Tallahassee, FL, United States, (11)USDA Forest Service, Northern Research Station, Houghton, MI, United States, (12)Michigan Technological University, School of Forest Resources and Environmental Science, Houghton, MI, United States, (13)University of Oregon, Eugene, OR, United States, (14)University of Arizona, Department of Ecology & Evolutionary Biology, Tucson, AZ, United States, (15)Stockholm University, Stockholm, Sweden, (16)University of New Hampshire, Durham, NH, United States, (17)Do Not Wish to Give out, Atlanta, GA, United States
 
Modeling interactions between fire behaviour and post-fire decomposition on boreal forest carbon stocks (580070)
Katherine E Todd-Brown, University of Florida, Gainesville, FL, United States; Wilfrid Laurier University, Waterloo, Canada, Jennifer Lynn Baltzer, Wilfrid Laurier University, Biology Department, Waterloo, ON, Canada and Merritt R Turetsky, University of Guelph, Guelph, ON, Canada
 
Improving the Simulation of Carbon Cycle Fluxes in Arctic-Boreal Vegetation in the Community Land Model (580540)
Leah Birch1, Christopher R Schwalm1, Gretchen Keppel-Aleks2, Danica L. Lombardozzi3, Susan Natali1, Xin Lin4, Jennifer Watts5 and Brendan M Rogers1, (1)Woods Hole Research Center, Falmouth, MA, United States, (2)University of Michigan Ann Arbor, Climate and Space Sciences and Engineering, Ann Arbor, MI, United States, (3)National Center for Atmospheric Research, Boulder, CO, United States, (4)University of Michigan Ann Arbor, Ann Arbor, MI, United States, (5)Woods Hole Research Center, Falmouth, United States
 
Near-decadal changes in active layer depth in Stordalen mire, Sweden (584589)
Pearl Mzobe1, Patrick M Crill2, Nigel T Roulet3 and Andreas Persson1, (1)Lund University, Lund, Sweden, (2)Stockholm University, Stockholm, Sweden, (3)McGill Univ, Montreal, QC, Canada
 
Broad-scale airborne mapping detects widespread methane emission hotspots associated with thermokarst (607989)
Clayton Elder1, David R Thompson1, Andrew K Thorpe1, Latha Baskaran1, Katey M Walter Anthony2 and Charles E Miller3, (1)Jet Propulsion Laboratory, Pasadena, CA, United States, (2)University of Alaska Fairbanks, Water and Environmental Research Center, Fairbanks, AK, United States, (3)Jet Propulsion Lab, Pasadena, CA, United States
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